TABLE 3.
Characteristics of aac(6′)-Ib-cr-positive and aac(6′)-Ib-cr-negative isolates
| Characteristica | No. of isolates with characteristic/total no. of isolates with aac(6′)-Ib-cr result (%)
|
Odds ratio (95% confidence interval) | P valued | |
|---|---|---|---|---|
| Positive (%) | Negative (%) | |||
| Patient characteristics | ||||
| Age ≥ 65 years | 17/44 (38.6) | 105/269 (39.0) | 0.9 (0.5-1.9) | 0.96 |
| Maleb | 21/44 (47.7) | 137/267 (51.3) | 0.9 (0.5-1.6) | 0.66 |
| Inpatientc | 21/44 (47.7) | 158/262 (60.3) | 0.6 (0.3-1.1) | 0.12 |
| qnr positive | 7/44 (15.9) | 66/269 (24.5) | 0.6 (0.3-1.5) | 0.26 |
| Strain characteristics | ||||
| K. pneumoniae | ||||
| CIP-R | 12/17 (70.6) | 63/89 (70.8) | 1.0 (0.3-3.1) | 0.99 |
| GEN-R | 7/17 (41.2) | 55/89 (61.8) | 0.4 (0.2-1.2) | 0.12 |
| SXT-R | 12/17 (70.6) | 72/89 (80.9) | 0.6 (0.2-1.8) | 0.34 |
| Enterobacter spp. | ||||
| CIP-R | 8/12 (66.7) | 98/148 (66.2) | 1.0 (0.3-3.6) | 0.98 |
| GEN-R | 7/12 (58.3) | 74/148 (50.0) | 1.4 (0.4-4.6) | 0.58 |
| SXT-R | 10/12 (83.3) | 83/148 (56.1) | 3.9 (0.8-18.5) | 0.09 |
| E. coli | ||||
| CIP-R | 15/15 (100) | 32/32 (100) | ||
| GEN-R | 13/15 (86.7) | 18/32 (56.3) | 5.8 (1.1-29.6) | 0.04 |
| SXT-R | 9/15 (60.0) | 25/32 (78.1) | 0.4 (0.1-1.6) | 0.20 |
a
CIP, ciprofloxacin; GEN, gentamicin; SXT, trimethoprim-sulfamethoxazole; R, resistant.
b
Information on sex was not available for two patients.
c
Information on inpatient status was not available for seven patients.
d
P values were determined by a two-tailed Fisher's exact test.